No more reverse,VS Auto

[Whichway]

G'day all.
A few weeks ago I had to replace my auto tranny(Got a 2nd hand one fitted),anyway,the other day I was reversing a trailer with a load of mulch in it(Not heavy)and I heard a big clunk,no more reverse but all forward ones are ok.Is the box shot or could there be an easy (cheap) fix.
Thanks.

[The1]

if you have all forward gears then id say reverse clutches. Do a search on google to 4L60E no reverse, plenty of info.

[whitevrboi]

Hey mate, I had a tranny with no reverse in it for a while but all my forward gears worked...I was being an idiot when it happened but I heard a loud clunk n I think it ended up being a cracked sunflex? sunrise? sun-something plate...I''m not entirely sure if thats why reverse didnt work but I ended up getting the whole box re-built with a corvette servo too....$1600 later...

[The1]

sunshell, yeh they go pretty easy.

[whitevrboi]

ahhh knew it was something like that lol

[Whichway]

Ok,thanks so far humans.I'll give the google a try and see what comes up.Cheers.